Fill net up at sea when fish are thus? (9)
I believe the answer is:
plentiful
'fish are thus?' is the definition.
I can't tell whether this defines the answer.
'fill net up at sea' is the wordplay.
'at sea' indicates anagramming the letters.
'fill'+'net'+'up'='fillnetup'
'fillnetup' anagrammed gives 'PLENTIFUL'.
'when' is the link.
Can you help me to learn more?
(Other definitions for plentiful that I've seen before include "Productive" , "Abundant - profuse" , "Abundant, copious" , "common" , "Existing in great quantities" .)